Illinois Route 135 (IL 135) is a 20.31-mile (32.69 km), L-shaped state road in Warren County, Illinois, United States, that runs from IL 164 west of Monmouth to Main Street in Alexis, at the base of the town's water tower.[1]
IL 135 is an undivided two-lane surface road for its entire length. It runs concurrently with IL 94 for a few miles north of Little York, and with U.S. Route 67 (US 67) for a few miles west of Alexis. IL 135 is signed in all four directions and changes directions at the turnoff from IL 94.
SBI Route 135 originally ran from IL 1 to State Road 154 (SR 154) near Hutsonville via a bridge over the Wabash River. This was removed in 1935; the bridge is now unnumbered. In 1937 it was applied on what was IL 94B, the current routing.[2]